ARMY TM 9-6115-464-12AIR FORCE TO 35C2-3-445-1NAVY NAVFAC P-8-624-12ad.ae.af.ag.ah.ai.aj.ak.al.am.an.ao.ap.Frequency Adjust Rheostat (29, Figure 2-1). The frequency adjust rheostat increases or decreases thefrequency output of the tactical precise generator sets.NOTEThe frequency adjust rheostat is functional on the precise generator sets only.Circuit Breaker Switch (30, Figure 2-1). The circuit breaker switch is a three position, momentary-on-mo-mentary-off toggle switch. It opens and closes the main load contactor. The circuit breaker switch is inthe center position during normal operation.Circuit Breaker Indicator (31, Figure 2-1). The circuit breaker indicator is a press-to-test indicator lightwith a yellow lens. It illuminates when the main load contactor is closed.Start-Run-Stop Switch (32, Figure 2-1). The start-run-stop switch is a three position toggle switch, usedto start and stop the generator set.Engine Primer Switch (33, Figure 2-1). The engine primer switch is a single pole, two position toggleswitch. When the START-RUN-STOP switch is in the START position and the ENGINE PRIMER switchis moved to the ON position, and then released, it actuates the ether starting aid. During operation, theswitch remains in the OFF position.Running Time Meter (34, Figure 2-1). The running time meter is a time totalizing meter which indicatestotal engine operating time in hours and tenths of hours.Battery Charging Ammeter (35, Figure 2-1). The battery charging ammeter is a dial indicator type gaugewhich measures dc current flow to and from the battery. It is calibrated in 1 ampere increments from -10to +20. Normal indication of the meter is dependent upon the state of charge of the battery. A low chargesuch as exists immediately after engine starting, will result in a high reading. When enough charge hasbeen restored to the battery the indicator should move near 0.Fuel Level Gauge (36, Figure 2-1). The fuel level gauge is a liquid quantity indicator gauge which is calibrated1/4 increments of tank quantity from E (empty) to F (full). It indicates the level of fuel in the main fuel tank.Engine Oil Pressure Gauge (37, Figure 2-1). The engine oil pressure gauge is a dial indicator type gaugewhich is calibrated in psig from 0 to 60. It measures engine lubrication oil pressure. Normal indication isfrom 20 to 55 psig.Coolant Temperature Gauge (38, Figure 2-1). The coolant temperature gauge is a dial indicator typegauge which is calibrated in degrees Fahrenheit from 120 to 240. Normal operation indication is 170°F(76.7°C) to 200°F (93.3°C).Fuel Selector Valve (Figure 1-5). The fuel selector valve is a three-way valve. It selects either the integraltank or the auxiliary source for fuel. It also serves as a shutoff valve.Frequency Selector Switch (Figure 1-4). The frequency selector switch is a two position, positive lockingtoggle switch. It is located on the precise relay assembly. The switch changes the generator circuit from60 Hz to 50 Hz operation. Most applications of the generator set will require that this switch be placedin the 60 Hz position.NOTEThe frequency selector switch is used on the 50/60 Hz Tactical Precise generatorsets only.Shutter Control Assembly. The shutter control assembly is a thermostatically controlled assembly. It is lo-cated at the bottom left of the radiator assembly. The assembly retains the shutter louvers (located behindthe grille) in the dosed position until the engine coolant has reached normal operating temperature.2-3
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